Motorola MH-45B4B speaker microphone, heavy duty public safety style w/volume switch, intrinsically safe.
This speaker mic is compatible with the following two way radio.
VX-160, VX-180, VX-230, VX-231, VX-261, VX-264, VX-350, VX-351, VX-354, VX-410, VX-414, VX-417, VX-420, VX-424, VX-427, VX-427A, VX-450, VX-451, VX-454, VX-459, EVX Series (eVerge).
NOTE: If this microphone is used on an IP rated radio, the IP rating is void because the microphone is not IP rated for submersibility in water.